晶粒组织结构对镍基高温合金持久性能的影响
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- 英文论文题名：Effect of Grain Structures on the Creep Rupture of Ni-based Superalloys
- 论文作者：李相伟 ; 谢光 ; 董加胜 ; 张功 ; 董哲 ; 彭建强 ; 楼琅洪 ; 张健
- 英文论文作者：Li Xiangwei ; Xie Guang ; Dong Jiasheng ; Zhang Gong ; Dong Zhe ; Peng Jianqiang ; Lou Langhong ; Zhang Jian ; University of Science and Technology of China ; Institute of Metal Research ; Chinese Academy of Sciences ; Beijing Beiye Functional Materials Corporation ; Harbin Turbine Co. ; Ltd.
- 年：2015
- 作者机构：中国科学技术大学材料科学与工程学院;中国科学院金属研究所高温合金部;北京北冶功能材料有限公司材料研究所;哈尔滨汽轮机厂有限责任公司;
- 论文关键词：镍基高温合金 ; 定向凝固 ; 持久性能 ; 等轴晶与柱状晶混合晶粒
- 英文论文关键词：Ni-based superalloys ; directional solidification ; creep rupture ; columnar and equiaxed transition
- 会议召开时间：2015-05-20
- 会议录名称：第十三届中国高温合金年会论文集
- 英文会议录名称：Proceedings of the 13th China Superalloys Conference
- 语种：中文
- 分类号：TG132.3
- 学会代码：ZGJS
- 会议名称：第十三届中国高温合金年会
- 会议地点：中国北京
- 主办单位：中国金属学会高温材料分会
- 学会名称：中国金属学会
- 页数：4
- 文件大小：1614k
- 原文格式：O
- 会议级别：全国
摘要
采用定向凝固工艺,整体铸造下端为等轴晶、上端为柱状晶的K417G试棒,对比研究等轴晶、柱状晶和等轴晶与柱状晶混合晶粒组织试样的显微组织以及950℃/235MPa和760℃/675MPa板状持久性能。结果表明:等轴晶转变为柱状晶时,碳化物的体积分数增加,且形貌从块状变为草书体状,而共晶和显微疏松的体积分数均显著降低。混合晶粒组织试样的持久性能与等轴晶组织试样的相当,但显著低于柱状晶组织试样。其中,950℃/235MPa持久试样以晶界滑移为主,断口为沿晶断裂;760℃/675MPa试样持久断口主要以晶内变形为主,呈现穿晶断裂。
Creep rupture of Ni-based superalloys with equiaxed,columnar and mixed grain stuctures at 760℃/645 MPa and950tV235MPa has been investigated by using OM and SEM.It was found that with the transition from equiaxed grain to columnar grain,MC carbides evolved from blocky to script-like,the volume fraction of eutectic and microporosity was reduced.The creep life of specimens with equiaxed and mixed grain structures are similar,but lower significantly than that with columnar grain structure.It was observed that grain boundary sliding is the main deformation mode at 950℃/235 MPa and it results in inter-granular fracture,while creep deformation is dominated by intragranular deformation at 760℃/675 MPa and with trans-granular fracture produced.
Creep rupture of Ni-based superalloys with equiaxed,columnar and mixed grain stuctures at 760℃/645 MPa and950tV235MPa has been investigated by using OM and SEM.It was found that with the transition from equiaxed grain to columnar grain,MC carbides evolved from blocky to script-like,the volume fraction of eutectic and microporosity was reduced.The creep life of specimens with equiaxed and mixed grain structures are similar,but lower significantly than that with columnar grain structure.It was observed that grain boundary sliding is the main deformation mode at 950℃/235 MPa and it results in inter-granular fracture,while creep deformation is dominated by intragranular deformation at 760℃/675 MPa and with trans-granular fracture produced.
引文
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[2]Helmink R C,Testin R A,et al.Advanced superalloys and tailored microstructures for integrally cast turbine wheels[C].Superalloys 2000,2000:171~179.
[3]Williams J C,Starke E A.Progress in structural materials for aerospace systems[J].Act.Mater.2003(51):5775~5799.
[4]Rozenberg N L Microcast-X fine grain casting-A process[C].Superalloys 1984,1984:23~32.
[5]Bouse G K,Behrend M R.Mechanical properies of microcast-X alloy 718 fine grain investment castings[C].Min.Met.Mater.1989:319~328.
[6]Bhaumik S K,Bhaskaran T A,et al.Failure of turbine rotor blisk of an aircraft engine[J].Eng.Fail.Anal.2002(9):287~301.
[7]杨院生,刘清民,等.液态金属电磁离心凝固的力场分析[J].金属学报,1994(30):208~212.
[8]Eckert S,Willers B,et al.Application of a rotating magnetic field during directional solidification of Pb-Sn alloys:Consequences on the CET[J],Mater.Sci.Eng.A,2005(413):211~216.
[9]李嘉荣,熊继春,等.先进高温结构材料与技术[M].北京:国防工业出版社,2012.
[10]杜贝宁,杨金侠,等.晶粒细化对K417G高温合金蠕变性能的影响[J].金属学报,2014(50):1384~1392.
[11]Li X W,Wang L,et al.Effect of solidification conditions and carbon content on the morphology of MC carbides in directional solidified Ni-based superalloys[J].J.Mater.Sci.Technol.,2014(30):1296~1300.
[12]Liu G,Liu L,et al.Influence of withdrawal rate on the microstructure of Ni-base single-crystal superalloys containing Re and Ru[J].J.All.Com,2011(509):5866~5872.
[13]李相伟,王莉,等.HRS和LMC工艺对第三代镍基单晶高温合金DD33中显微孔洞的影响[J].材料研究学报,2014(28):656~662.
[14]Soula A,Renollet Y,et al.Analysis of high temperature creep deformation in a polycrystalline nickel-base superalloy[J].Mater.Sci.Eng.A,2009(510):301~306.
[15]Thibault K,Locq D,et al.Influence of microstructure on local intra and intergranular deformations during creep of a nickel-based superalloy at 700 degrees C[J].Mater.Sci.Eng.A,2013(588):14~21.